NAME

       MPI_Win_test - Attempts to complete an RMA exposure epoch; a nonblocking version of MPI_Win_wait

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Win_test(MPI_Win win, int *flag)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_WIN_TEST( WIN, FLAG, IERROR)
            INTEGER  WIN, IERROR

C++ Syntax

       #include <mpi.h>
       bool MPI::Win::Test() const

INPUT PARAMETERS

       win       Window object (handle)

OUTPUT PARAMETERS

       IERROR    Fortran only: Error status (integer).

       flag      The returning state of the test for epoch closure.

DESCRIPTION

       MPI_Win_test   is   a  one-sided  MPI  communication  synchronization  call,  a  nonblocking  version  of
       MPI_Win_wait. It returns ag = true if MPI_Win_wait would return, ag =  false  otherwise.  The  effect  of
       return  of  MPI_Win_test  with flag = true is the same as the effect of a return of MPI_Win_wait. If ag =
       false is returned, then the call has no visible effect.

       Invoke MPI_Win_test only where MPI_Win_wait can be invoked. Once the call has returned ag = true, it must
       not be invoked anew, until the window is posted anew.

ERRORS

       Almost  all  MPI  routines  return  an  error  value; C routines as the value of the function and Fortran
       routines in the last argument. C++ functions do not return errors. If the default error handler is set to
       MPI::ERRORS_THROW_EXCEPTIONS,  then  on  error  the  C++  exception  mechanism  will  be used to throw an
       MPI:Exception object.

       Before the error value is returned, the current MPI error handler  is  called.  By  default,  this  error
       handler  aborts  the  MPI  job,  except  for  I/O  function errors. The error handler may be changed with
       MPI_Win_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error  values
       to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Win_post MPI_Win_wait

                                                  Jun 26, 2013                                   MPI_Win_test(3)